show miner name on block timeline

backend/src/api/blocks.ts

@@ -34,6 +34,7 @@ import { calculateFastBlockCpfp, calculateGoodBlockCpfp } from './cpfp';
 import mempool from './mempool';
 import CpfpRepository from '../repositories/CpfpRepository';
 import accelerationApi from './services/acceleration';
+import { parseDATUMTemplateCreator } from '../utils/bitcoin-script';
 
 class Blocks {
   private blocks: BlockExtended[] = [];
@@ -342,7 +343,12 @@ class Blocks {
           id: pool.uniqueId,
           name: pool.name,
           slug: pool.slug,
+          minerNames: null,
         };
+
+        if (extras.pool.name === 'OCEAN') {
+          extras.pool.minerNames = parseDATUMTemplateCreator(extras.coinbaseRaw);
+        }
       }
 
       extras.matchRate = null;

backend/src/mempool.interfaces.ts

@@ -299,6 +299,7 @@ export interface BlockExtension {
     id: number; // Note - This is the `unique_id`, not to mix with the auto increment `id`
     name: string;
     slug: string;
+    minerNames: string[] | null;
   };
   avgFee: number;
   avgFeeRate: number;

backend/src/repositories/BlocksRepository.ts

@@ -14,6 +14,7 @@ import chainTips from '../api/chain-tips';
 import blocks from '../api/blocks';
 import BlocksAuditsRepository from './BlocksAuditsRepository';
 import transactionUtils from '../api/transaction-utils';
+import { parseDATUMTemplateCreator } from '../utils/bitcoin-script';
 
 interface DatabaseBlock {
   id: string;
@@ -1054,6 +1055,7 @@ class BlocksRepository {
       id: dbBlk.poolId,
       name: dbBlk.poolName,
       slug: dbBlk.poolSlug,
+      minerNames: null,
     };
     extras.avgFee = dbBlk.avgFee;
     extras.avgFeeRate = dbBlk.avgFeeRate;
@@ -1123,6 +1125,10 @@ class BlocksRepository {
       }
     }
 
+    if (extras.pool.name === 'OCEAN') {
+      extras.pool.minerNames = parseDATUMTemplateCreator(extras.coinbaseRaw);
+    }
+
     blk.extras = <BlockExtension>extras;
     return <BlockExtended>blk;
   }

backend/src/utils/bitcoin-script.ts

@@ -200,4 +200,27 @@ export function getVarIntLength(n: number): number {
   } else {
     return 9;
   }
+}
+
+/** Extracts miner names from a DATUM coinbase transaction */
+export function parseDATUMTemplateCreator(coinbaseRaw: string): string[] | null {
+  let bytes: number[] = [];
+  for (let c = 0; c < coinbaseRaw.length; c += 2) {
+      bytes.push(parseInt(coinbaseRaw.slice(c, c + 2), 16));
+  }
+
+  // Skip block height
+  let tagLengthByte = 1 + bytes[0];
+
+  let tagsLength = bytes[tagLengthByte];
+  if (tagsLength == 0x4c) {
+    tagLengthByte += 1;
+    tagsLength = bytes[tagLengthByte];
+  }
+
+  const tagStart = tagLengthByte + 1;
+  const tags = bytes.slice(tagStart, tagStart + tagsLength);
+  const tagString = String.fromCharCode(...tags);
+
+  return tagString.split('\x0f');
 }